41
MM-PCM Series
PROBLEM
POSSIBLE CAUSE
SUGGESTED SOLUTIONS
Line fuse
blows.
1. Line fuse is the wrong size.
1. Check that the line fuse is
correct for the motor size.
2. Motor cable or armature is
shorted to ground.
2. Check motor cable and
armature for shorts.
3. Nuisance tripping caused by
a combination of ambient
conditions and high-current
spikes (i.e. reversing).
3. Add a blower to cool the
drive components, decrease
TORQUE LIMIT settings, resize
motor and drive for actual
load demand, or check for
incorrectly aligned mechanical
components or “jams”. See
page 27 for information on
adjusting the TORQUE LIMIT
trim pot.
Line fuse does
not blow, but
the motor does
not run.
1. Speed adjust potentiometer
or input voltage signal is set
to zero speed.
1. Increase the speed adjust
potentiometer setting or input
voltage or current signal.
2. INHIBIT mode is active.
2. Add a short between terminals
3 and 4 and remove any short
between terminals 4 and 5.
3. S2 is shorted to S1.
3. Remove the short.
4. Drive is in current limit.
4. Verify that the motor is not
jammed. Increase TORQUE
LIMIT setting if set too low.
5. Drive is not receiving AC line
voltage.
5. Apply AC line voltage.
6. Motor is not connected.
6. Remove power. Connect the
motor to A1 and A2. Reapply
power.
